Research On Morphing Wing Based On NiTi Shape Memory Alloy

In recent years,artificial intelligence and big data have emerged.Shape memory alloy has become a research hotspot.The 5G technology has been successfully applied to the market.Established on materials,electronics,computers and Communication technology,Aerospace technology is bound to usher in new developments.On the military side,the sixth-generation aircraft is currently defined as having 8 typical capabilities:wide stealth,strong perception,long range,super agility,cloud network,flash kill,building block combination architecture,and software-defined functions.Among them,before the controllable nuclear reaction technology can be applied to the aircraft,long range and super agility can be understood as the aircraft need to have the characteristics of high efficiency and high performance.For the wing,high efficiency and high performance mean that the best aerodynamic performance can be achieved in the flight environment.The traditional wing is fixed.It can only have the best aerodynamic performance under specific flight conditions.Therefore,morphing wing with high deformation freedom have become the focus of research.Combining theory,finite element analysis and experiment,this paper proposes a morphing wing solution suitable for biconvex wing using NiTi shape memory alloy as actuator.In order to facilitate manufacturing,highlight functionality and reduce maintenance costs,the flexible wing structure is designed using a modular approach.In order to achieve easy control of bidirectional deflection,a differential drive structure is used.In order to optimize the continuity and smoothness of the wing's surface after deflection and the design of the wing structure size parameters,general finite element analysis software is used for auxiliary design.In order to verify the validity of the simulation design and the rationality of the structural design,a morphing wing model was fabricated using 3D printing technology and selective laser sintering technology,and a test platform was built for actual measurement analysis.The research has achieved the following results:1.A NiTi alloy spring with middle diameter of 8.3mm,wire diameter of 0.7mm,and pitch of 1.5mm was prepared,and its phase transition temperature was measured by DSC experiment.The shape memory effect of the spring is obvious,and the driving stroke and driving force meet the requirements of morphing wings;2.A morphing wing structure with NiTi spring as the actuator is designed.The wing structure can complete the smooth and continuous deformation,which can effectively improve the aerodynamic performance of the aircraft compared with the traditional wing;3.Using 3D printing technology and selective laser sintering technology,the prototype of the morphing wing was fabricated,and a simple control platform was set up to measure the prototype.After actual measurement,the morphing wing can rotate 9 degrees under the current of 2A.The response time is about 20s,and the morphing wing's surface is smooth and continuous when deformed.